mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
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f1a9dd8a98
The call to serviceCreate(...) tries to query pointer buffer size, but since we haven't had a chance to return the server side of the session yet, this deadlocks. Instead, we defer creating the session and mounting the filesystem until the first time the ECS object is used. If mounting the filesystem fails, the ECS is silently discarded.
122 lines
4.2 KiB
C++
122 lines
4.2 KiB
C++
/*
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* Copyright (c) 2018-2019 Atmosphère-NX
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "ldr_ecs.hpp"
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namespace ams::ldr::ecs {
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namespace {
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/* Convenience definition. */
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constexpr size_t DeviceNameSizeMax = 0x20;
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constexpr size_t MaxExternalContentSourceCount = 0x10;
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/* Types. */
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class ExternalContentSource {
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NON_COPYABLE(ExternalContentSource);
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NON_MOVEABLE(ExternalContentSource);
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private:
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bool has_mounted = false;
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char device_name[DeviceNameSizeMax];
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os::ManagedHandle client;
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Result Mount() {
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/* Create service. */
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Service srv;
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serviceCreate(&srv, client.Move());
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FsFileSystem fs = { srv };
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auto fs_guard = SCOPE_GUARD { fsFsClose(&fs); };
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/* Try to mount. */
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R_UNLESS(fsdevMountDevice(device_name, fs) >= 0, fs::ResultMountNameAlreadyExists());
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fs_guard.Cancel();
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this->has_mounted = true;
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return ResultSuccess();
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}
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public:
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ExternalContentSource(const char *dn, os::ManagedHandle client) : client(std::move(client)) {
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std::strncpy(this->device_name, dn, sizeof(this->device_name));
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this->device_name[sizeof(this->device_name) - 1] = '\0';
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}
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Result EnsureMounted() {
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if (!this->has_mounted) {
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return Mount();
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}
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return ResultSuccess();
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}
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~ExternalContentSource() {
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if (this->has_mounted) {
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fsdevUnmountDevice(this->device_name);
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}
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}
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const char *GetDeviceName() const {
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return this->device_name;
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}
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};
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/* Global storage. */
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std::unordered_map<u64, ExternalContentSource> g_map;
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}
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/* API. */
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const char *Get(ncm::ProgramId program_id) {
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auto it = g_map.find(static_cast<u64>(program_id));
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if (it == g_map.end()) {
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return nullptr;
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}
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if (R_FAILED(it->second.EnsureMounted())) {
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g_map.erase(it);
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return nullptr;
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}
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return it->second.GetDeviceName();
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}
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Result Set(Handle *out, ncm::ProgramId program_id) {
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/* TODO: Is this an appropriate error? */
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R_UNLESS(g_map.size() < MaxExternalContentSourceCount, ldr::ResultTooManyArguments());
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/* Clear any sources. */
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R_ASSERT(Clear(program_id));
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/* Generate mountpoint. */
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char device_name[DeviceNameSizeMax];
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std::snprintf(device_name, DeviceNameSizeMax, "ecs-%016lx", static_cast<u64>(program_id));
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/* Create session. */
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os::ManagedHandle server, client;
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R_TRY(svcCreateSession(server.GetPointer(), client.GetPointer(), 0, 0));
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/* Do not create service yet. */
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/* Defer until we've handed the server side back so we don't deadlock on querying pointer buffer size. */
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/* Add to map. */
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g_map.emplace(std::piecewise_construct,
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std::make_tuple(static_cast<u64>(program_id)),
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std::make_tuple(device_name, std::move(client)));
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*out = server.Move();
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return ResultSuccess();
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}
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Result Clear(ncm::ProgramId program_id) {
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/* Delete if present. */
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g_map.erase(static_cast<u64>(program_id));
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return ResultSuccess();
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}
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}
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